Diestock



March 11, 1930.

1. w. NONNEMAN 1,750,241

DIESTOCK Filed July .1927 2 Shuts-Sheet March 11, 1930 w NQNNEMAN 1,750,241

DIESTOCK Filed July 8) 1927 2 Sheets-Sheet 2 WVQ Patented Mar. 11, 1939 UNITED STATES PATENT OFFICE IRA W. NONNEMAN, OF WARREN, OHIO, ASSIGNOR T0 BORDEN COMPANY, OF WARREN, OHIO, A CORPORATION OF OHIO DIESTOCK Application filed. July 8, 1927. Serial No. 204,236.

This invention relates to a die stock of the type adapted to cut tapered threads by the employment of chasers which recede during the threading operation.

An object of the invention is to so embody the essential features of such a die stock that the mechanism consists of comparatively few parts of simple construction, resulting in a tool which is comparatively light and cheaply manufactured, but at the same time is eificient in service and durable.

My invention is hereinafter more fully explained in connection with the drawings, which show an approved embodiment thereof, and the essential novel features are summarized in the claims.

In the drawings, Fig. 1 is a plan or face view of the die stock; Fig. 2 is a diametric section thereof, as indicated by the line 22 on Fig. 1; Fig. 8 is a cross section through the die stock in a plane transverse to one of the chasers and intersecting the same, as indicated by the line 3-3 on Fig. 1; and the offset line 4-4 on Fig. 2.

As shown in the drawings, indicates a suitable frameadapted to surround the pipe and be clamped thereto by any suitable means. The intermediate body of the frame may be open for lightness of construction, as shown at 11 in Fig. 2. Near its forward end this frame has a continuous ring-like head 15, which is internally threaded at 16, while on the exterior is a flange 17 Opposite to this flange is a removable ring 18 threaded on the head, and abutting a shoulder to leave a groove between them.

The chasers are covered by a rotatable cylindrical frame, having an externally threaded sleeve portion 20 engaging the internal threads 16, and having a laterally extending disk-like head 21, preferably integral with the sleeve. On this head are provided radial chaserhousings 22, four being shown in the drawings. Each of these housings, as shown, comprises a pair of upstanding ribs overhanging a rectangular space. The chasers 8O occupy the housings described. These chasers are rectangular in cross section, and are comparatively long bars slidable in the space nearly bounded by the housings and head 21. The chasers are prevented from inadvertently dropping inward by reason of the plungers 31 slidably mounted in the lions ings, and bearing against the chasers, being forced inwardly by leaf springs 32 secured at the side of the housings.

Rotatably mounted in the external groove on the stationary frame provided by the shoulder 17 and the ring 18 is a rotatable ring 40. This ring rigidly carries upwardly extending pins 41, which project through notches in the head. 21 and engage the outer ends of the chasers 30, there being one pin 41 for each chaser. The inner face of the pin is fiat and flares inwardly from the ring toward the axis of the die stock. These pins 41 form abutments for the chasers. As the threading continues, the chasers are carried along toward the stationary frame and thus travel along the pins 41, which allow them to spread outwardly, thus effecting the tapered thread.

The threading operation necessarily throws stress on the pins 41 and to take this I provide a ring embracing all the pins, contacting with their outer sides. and being rigidly secured thereto by clamp screws 51, which preferably pass freely through the ring 50 into threaded openings in the pins.

The pins 41 may be secured to the ring 40 in any desired manner. In order to make the connection cheaply and at the same time make it very rigid, I prefer to first form the pins and then suitably locate them in a mould and cast the ring 40 about the end portions of the pins, so that the pins become autogenously connected to the ring, as illustrated in Fig. 2.

The pins 41 near their extreme upper free ends have inwardly overhanging shoulders 43, which lap over the chasers. This limits the upward movement of the chaser frame with reference to the pins and prevents inadvertent separation of the die stock.

It is to be understood that the pitch of the external and internal threads of the rotary and stationary frames is the same as the pitch of the chasers and of the pipe to be cut. The pitch is the same for several adjacent sizes of pipe in standard threading.

Accordingly, to enable this same die stock to operate on pipes of different sizes, it is only necessary to provide chasers of different length, according to the pipe to be threaded, and to provide for clamping such size of the pipe.

The clamping means, which may be of any suitable form, is shown as comprising two radially movable plungers 60 and a radial screw all mounted in the annular frame 10.

ith the plungers 60 set to correspond with the size of chaser, the machine is ready for threading. It is passed over the end of the pipe and clamped in place by turning in of the screw 70. Then the chaser-carrying frame and tapered pins may be rotated as a unit, by means of the usual diametric handles 80, of which one is indicated in Fig. 1. Such handles preferably occupy intern ally threaded sockets 54 formed integrally on the outer face of the ring 50. Such ring and sockets being preferably braced by suitable webs and gussets 55 and 56.

If the sockets 54 are located as shown in Fig. 1, the screws 51 for clamping two of the pins -11 pass through the base of the respective sockets. where they are out of the way. The frame member 50 being turned by the handles carry the pins 41, which latter occupy notches in the chaser frame, the chaser frame must turn correspondingly and hence the ehasers out the pipe. The rotation, however, causes the chaser frame to move into the stationary frame relative to the pins, wherefore the chasers are led according to the taper to be cut. The head of the chaser frame is an annular disk having a circular periphery close to the inner face of the cylindrical ring 50, which also forms a guide for such disk head.

I claim:

1. In a die stock, the combination of a stationary frame, a rotatable ring thereon, tapered pins rigidly carried by the ring, a chaser carrying frame having a sleeve portion threaded to the stationary frame and having a head portion with chaser housings, chasers occupying said housings and engaging the pins, and a ring independent of the chaser carrying frame surrounding the set of pins and rigid with them and adapted to receive the outward thrust thereon.

2. In a die stock, the combination of a stationary frame, a rotatable rin thereon, pins having tapered inner faces carried rigidly by the ring, a chaser carrying frame having a sleeve portion threaded to the stationary frame and having a head portion with radial housings, chasers occupying said housings and at their outer ends abutting the inner faces of the pins, a ring independent of the chaser carrying frame surrounding the set of pins and adapted to receive the outward thrust thereon, and means clamping said thrust ring to the pins.

In a die stock, the combination of a stationary frame, a rotatable ring thereon, tapered pins rigidly carried by the ring, a chaser carrying frame having a sleeve porion threaded to the stationary frame and having a head portion with chaser housings, chasers occupying said housings and engaging the pins, a ring independent of the chaser carrying frame surrounding the set of pins and rigid with them and adapted to receive the outward thrust thereon, and sockets for the operating handles formed integrally with the thrust ring.

4. In a die stock, the combination of a stationary frame, a rotatable ring thereon, pins having tapered inner faces rigidly carried by the ring, a chaser carrying frame having a sleeve portion threaded to the stationary frame and having a disc head with radial housings, chasers occupying said housings and abutting the inner faces of the pins, said pins occupying notches in the chaser frame, and a ring loosely embracing said disc head and surrounding the set of pins and adapted to receive the outward thrust thereon, screws clamping said thrust ring to the pins respectively and sockets for the operating handles formed on the thrust ring.

5. In a die stock, the combination of a stationary frame, a revoluble chaser carrying frame, a revoluble device on the stationary frame, tapered pins rigidly carried by one of said revoluble members and enacting with the other, and a ring rigidly engaging the midregion of the pins to sustain the outward thrust thereon.

6. In a die stock, the combination of a sta tionary frame, a rotatable chaser carrying frame having a progressive engagement with the stationary frame, a rotatable ring mounted on the stationary frame, tapered pins carried by one of said rotatable members engaging the other, and a ring rigidly engaging the various pins, the chaser carrying frame having a disk-like head adapted to seat closely within said ring.

7. In a die stock, the combination of a stationary frame, a revoluble chaser carrying frame having a head with a circular periphery having edge notches, a revoluble member on the stationary frame, tapered pins rigidly carried by said revoluble member and occup ing said notches and coacting with the chasers, and a ring rigidly engaging the mid-region of the pins to sustain the outward thrust thereon, the chaser frame being adapted to seat closely within said ring.

8. In a die stock, the combination of a stationary frame, a rotatable ring thereon, tapered pins carried by the ring, a chaser carrying frame having a sleeve portion threaded to the stationary frame and having a disklike head portion with chaser housings, chasers occupying the housings and having their outer ends abutting the pins, and a ring surrounding the set of pins rigidly secured thereto and adapted to receive the outward thrust thereon, sai-d chaser frame having a disk-like head adapted to seat closely Within said ring and having externally open notches occupied by the tapered pins.

9. In a die stock, the combination of a stationary frame, a revoluble chaser-carrying frame, a member revoluble on the stationary frame, pins rigidly carried by said member and tapered longitudinally on their inner sides, Chasers carried by the chaser frame bearing on their outer ends against said pins, and a ring bracing said pins and rigid With them.

10. In a die stock, the combination of a stationary frame, a revoluble chaser-carrying frame, a ring revolnble on the stationary frame, tapered pins onto which the said ring is cast so that the pins are autogenously joined to the ring, and another ring fixedly engaging the pins above their bases.

11. In a die stock, the combination of a stationary frame, a revoluble ring thereon, pins tapered on their face rigidly carried in the ring, a chaser carrying frame progressively and rotatably connected With the stationary frame and having a head With a substantially circular contour With notches in the periphery, said pins occupying said notches, chas ers carried by the chaser frame having their outer ends abutting the inner faces of the pins, and a ring fixedly embracing the pins and having notches on its inner periphery occupied by the outer portion of the pins, the inner periphery of the ring being only slightly larger than the periphery of the head, Whereby the latter may fit closely Within the ring.

In testimony whereof, I hereunto afiiX my signature.

IRA W. NONNEMAN. 

